Cash ISA

Monmouthshire Building Society 2 Year Fixed Rate Cash ISA Review

A two-year cash ISA from Monmouthshire Building Society, with a £1,000 minimum deposit. It ranks 42nd of 44 two-year cash ISAs we track.

Fixed rate · 2 years

3.85%AER

Rate checked Oct 2026Got this account? Leave a review

Protection

FSCS£120,000

Min balance

£1,000

Max balance

£20,000

Access

At maturity only

Interest paid

Annually

How It Stacks Up

Ranks 42nd of 44

2-year cash ISAs we track

Well below average
This account 3.85%
UK CPI (Aug 2026)
3.10%
Pays 0.75% more
Average 2-year cash ISA
4.50%
Pays 0.65% less
Best 2-year cash ISA
5.05%
Pays 1.20% less

Inflation: ONS. Averages and best rates: accounts on DepositScout.

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Worth Weighing Up

  • Con: Your money is locked in for 2 years
  • Con: You need at least £1,000 to open it

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Estimated returns with Monmouthshire Building Society's Cash ISA

What you could earn with Monmouthshire Building Society's 2 Year Fixed Rate Cash ISA.

Estimated interest

£1,000 saved

£78.48

At 3.85% AER

£5,000 saved

£392

At 3.85% AER

£10,000 saved

£785

At 3.85% AER

£20,000 saved

£1,570

At 3.85% AER

Estimated over the 24-month term, if the rate stays the same and interest is left in. Amounts outside the account's minimum or maximum aren't shown.

Our Expert Opinion on Monmouthshire Building Society 2 Year Fixed Rate Cash ISA

Jonny PeaseCo-Founder, DepositScout

Monmouthshire Building Society's 2 Year Fixed Rate Cash ISA pays 3.85%, but that sits 1.27% below the current cash ISA market leader at 5.12%, putting it below the market average and making it hard to recommend on rate alone. The £1,000 minimum is accessible enough, though the £20,000 cap means higher-rate taxpayers wanting to shelter more will hit a ceiling, and the money is locked until maturity with no access. It does beat August 2026 CPI of 3.1% by 0.75%, so at least you're preserving real value, but I would look at Tembo's Standard Cash ISA at 4.00% before committing here.

Compare Cash ISAs

2 alternatives to Monmouthshire Building Society's 2 Year Fixed Rate Cash ISA

Same type of account, closest on rate.

Common questions about the 2 Year Fixed Rate Cash ISA

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